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Published online by Cambridge University Press: 20 November 2018
1. Introduction. Widder has pointed out (2, p. 219) in connection with Wiener's fundamental work on the operational calculus (1, pp. 557-584), that the convolution transform
(1.1)
will be inverted by the operator DE (D), where D = d/dx, and
,
where a suitable interpretation must be found for E(D).